Rear Bearing: A Comprehensive Guide

Importance of Rear Bearings

Rear bearings play a crucial role in the smooth operation of automobiles. They support the weight of the vehicle and reduce friction between the axle and the wheel. Properly functioning rear bearings are essential for safe and efficient driving.

Statistics

According to the National Highway Traffic Safety Administration (NHTSA), rear bearing failures account for approximately 12% of all vehicle breakdowns. This emphasizes the importance of regular inspection and maintenance of rear bearings.

Types of Rear Bearings

There are two main types of rear bearings:

1. Tapered Roller Bearings: These bearings consist of tapered rollers that run between a cone-shaped inner race and a cup-shaped outer race. They are commonly used in heavy-duty vehicles due to their durability and high load capacity.

   

2. Ball Bearings: These bearings consist of a set of ball bearings that roll between an inner and outer race. They are often used in lighter vehicles due to their low friction and ease of installation.

Common Causes of Rear Bearing Failure

Rear bearings can fail due to several factors, including:

• Wear and Tear: Over time, the bearings wear out due to constant use and friction.
• Excessive Load: Overloading the vehicle can put excessive stress on the bearings, leading to premature failure.
• Improper Lubrication: Inadequate or contaminated lubrication can prevent the bearings from operating smoothly and lead to overheating and failure.
• Water Damage: Exposure to water or moisture can cause rust and corrosion, damaging the bearings and reducing their lifespan.

Symptoms of Rear Bearing Failure

The following symptoms may indicate rear bearing failure:

• Grinding or Humming Noise: A grinding or humming noise coming from the rear of the vehicle while driving may be a sign of worn-out bearings.
• Vibration: Excessive vibration in the steering wheel or vehicle body can also be a symptom of rear bearing failure.
• Loose Wheel: A loose rear wheel that wobbles or shifts side-to-side is another indication of a failing bearing.
• Difficulty Turning: If the vehicle has difficulty turning or pulling to one side, it may be due to a worn-out rear bearing.

Common Mistakes to Avoid

When dealing with rear bearings, it is important to avoid the following mistakes:

• Ignoring Warning Signs: Ignoring the symptoms of rear bearing failure can lead to more serious problems and potentially dangerous situations.
• Attempting DIY Repairs: Rear bearing replacement requires specialized tools and knowledge. Attempting DIY repairs can damage the bearings or other components.
• Using Substandard Parts: Using cheap or aftermarket parts for rear bearing replacement can compromise the safety and performance of the vehicle.

How to Replace Rear Bearings (Step-by-Step)

Replacing rear bearings is a complex procedure that should be performed by a qualified mechanic. However, the following steps provide a general overview of the process:

1. Gather Tools and Materials: Before starting, gather the necessary tools and materials, including a jack, jack stands, axle nut wrench, socket wrench, and new rear bearings.
2. Safety First: Park the vehicle on a level surface, engage the parking brake, and chock the wheels.
3. Remove the Rear Wheel: Loosen the axle nut using an axle nut wrench, then jack up the vehicle and remove the rear wheel.
4. Disconnect the Brake Caliper: Unbolt the brake caliper from the knuckle and hang it securely without disconnecting the brake line.
5. Remove the Axle Nut and Bearing Hub: Remove the axle nut and use a hammer to gently tap the bearing hub out of the knuckle.
6. Press Out the Old Bearing: Using a bearing press or a hammer and chisel, carefully press out the old bearing from the hub.
7. Insert the New Bearing: Press the new bearing into the hub using a bearing press.
8. Reassemble the Components: Reassemble the bearing hub, axle nut, brake caliper, and wheel.
9. Tighten the Axle Nut: Tighten the axle nut to the specified torque using an axle nut wrench.
10. Lubricate and Inspect: Lubricate the bearings and inspect all components for proper function before driving the vehicle.

Pros and Cons of Different Rear Bearing Types

Tapered Roller Bearings:

• Pros:
• High load capacity
• Durable
• Cons:
• More complex to install
• Higher maintenance requirements

Ball Bearings:

• Pros:
• Low friction
• Easy to install
• Cons:
• Lower load capacity
• Less durable

Frequently Asked Questions (FAQs)

Q1: How often should I inspect my rear bearings?
A1: Rear bearings should be inspected every 5,000-10,000 miles or as recommended in the vehicle's maintenance schedule.

Q2: Can I replace rear bearings myself?
A2: While replacing rear bearings is possible with the right tools and knowledge, it is recommended to have it done by a qualified mechanic to ensure proper installation and safety.

Q3: How much does it cost to replace rear bearings?
A3: The cost of replacing rear bearings varies depending on the type of bearings, the vehicle model, and the labor rates in your area. Expect to pay anywhere from $200 to $1,000 per wheel.

Q4: What are the signs of a failing rear wheel bearing?
A4: Symptoms of a failing rear wheel bearing include a grinding or humming noise, vibration, loose wheel, and difficulty turning.

Q5: How long do rear bearings last?
A5: Rear bearings typically last between 50,000 to 100,000 miles depending on driving conditions and maintenance practices.

Q6: Is it safe to drive with a bad rear bearing?
A6: Driving with a bad rear bearing is not recommended as it can lead to further damage and increase the risk of accidents.

Interesting Stories

Story 1:

A young mechanic was struggling to remove a stubborn rear bearing. In a moment of frustration, he exclaimed, "This thing is like a mule's backbone!" Turns out, the mule was standing right behind him, and it charged at him, sending him stumbling backward into a pile of scrap metal.

Lesson: Never underestimate the power of a mule and be careful what you say around animals.

Story 2:

An elderly woman brought her car to a mechanic because of a strange noise coming from the rear. The mechanic inspected the vehicle and determined that the rear bearings were shot. When he told the woman, she replied, "Well, I guess they had a good run. I bought this car when I was a teenager, and it's been carrying my kids and grandkids around for years."

Lesson: Even machines have a lifespan, and it's important to appreciate the memories they hold.

Story 3:

Two friends were driving down the highway when they heard a loud grinding noise from the rear. They pulled over and discovered a loose rear wheel. As they were trying to tighten the lug nuts, one friend asked the other, "How did this even happen?" The other friend replied, "Well, I was driving, and I thought I saw a shortcut, but it turned out to be a bumpy dirt road. I guess that did it."

Lesson: Always be aware of your surroundings and avoid shortcuts that may lead to unexpected consequences.

Table 1: Rear Bearing Failure Statistics

Table 2: Symptoms of Rear Bearing Failure

Table 3: Pros and Cons of Different Rear Bearing Types